diff --git a/sql/core/src/test/scala/org/apache/spark/sql/DateFunctionsSuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/DateFunctionsSuite.scala
index ff1c7562dc4a63eb78a4353be6c6addac65f027e..001fcd035c82a3170474ae0be43390d538d5fd63 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/DateFunctionsSuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/DateFunctionsSuite.scala
@@ -203,7 +203,7 @@ class DateFunctionsSuite extends QueryTest {
       Seq(Row(Date.valueOf("2015-07-27")), Row(Date.valueOf("2015-07-27"))))
     checkAnswer(
       df2.select(next_day(col("t"), "th")),
-      Seq(Row(Date.valueOf("2015-07-30")), Row(null)))
+      Seq(Row(Date.valueOf("2015-07-30")), Row(Date.valueOf("2015-07-30"))))
   }
 
 }